Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15d25fcde0e3570…

MALICIOUS

PDF

78.4 KB Created: 2021-08-29 02:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1bd678b0cddf4e6d66d4904a5c05a98a SHA-1: b5a51879978a5ec3a10abf6244011b81ecc79b90 SHA-256: e15d25fcde0e35701d7db13814e6dbb44f536a0be1e21c2f7ed3778626d201f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mirrorlink.com/public/files/files/52853289998.pdf In PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/fufefowiwof.pdfIn PDF document text
    • http://wami.cc/data/files/pomew.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/73142508993.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/rosojuwagugoligaveki.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/dugatodoti.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a9a5fd4fd375b5ff0346f73884fae7b/ranetakepupaw.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/88863704378.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160839c576fb74---giluvefuti.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/80659492259.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/sanariw.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/3474853084.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e6b91fe29---matakixu.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/junowunubowimo.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/kediwoborotatu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s68qg5dll9err3lno3jnadbtst/duxadarimikomebefometina.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3bd9rfj8nmm7n6ne80d9929nlu/mazozo.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/80387937538.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6a41a5a9---xomug.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/25005126726.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee43f7ee22---valenusovulel.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/bedevevikiwenur.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/juzesesekexarewir.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r4o6t270pdd9ki2rhkavgilsi0/tegesaxeviriborosad.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/62266907572.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/wevufawogujivaxifawa.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/degidame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sneak+up+on+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 17572 bytes
SHA-256: 97511117cf6ad3c87a73de7f8584530e16344efe12cb57fdfcfc5e383ae4dd81
font_01_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 10448 bytes
SHA-256: 65485f055c3539901520b44feaa2a62669c923f3a4386a80c21dca4a678c92a7
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1